Here is the full list of all 30 Curse of the Dead Gods achievements.
Unlock all Weapon Altars upgrades
Get 3 successful Parries in less than 2 seconds
Equip the three weapons slots with Cursed weapons
Make 10 Blood Offerings during a single exploration
Lift the Final Curse
Unlock 20 Blessings of the Dead Gods
Complete any exploration with 50 or more Dexterity
Become the new Champion of Death
Unlock 20 Forsaken Weapons
Equip a hidden Champion weapon
Complete any exploration with 50 or more Constitution
Defeat Clovis Pardieux, Champion of Death
Complete any exploration with 50 or more Perception
Defeat the Dark Avatar of the Serpent
Defeat the Dark Avatar of the Eagle
Defeat the Dark Avatar of the Jaguar
Defeat Ratyapu, the Abomination
Write 5 Bestiary entries
Defeat Malok paal, the Flesh Monstrosity
Achieve a x10 "Greed Kill" series
Unlock 5 Forsaken Weapons
Start a "Special Event"
Defeat Litz & Nepac, the Cursed Twins
Unlock a Blessing of the Dead Gods
Defeat Xucat', the Witch
Defeat K'ax taca, High Lord of the Storm
Defeat Xak'olchir, the Blood Hunter
Complete the room of Trials
Complete 10 different "Special Events"
Write all Bestiary entries with their complete sketches